---
phase: "01"
plan: "01-01"
created: 2026-01-01
---
<!-- provenance: template-derived (gsd-core/templates/). NOT real-user-sourced. See #2371 — adequate for happy-path/sequence scenarios, NOT sufficient as a negative fixture asserting the engine correctly rejects input. -->

# Plan 01-01: Tokenizer

## Tasks

- [ ] Write the markdown task-list tokenizer
- [ ] Handle malformed list items without crashing